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java.lang.NoSuchFieldError: level	at org.apache.log4j.spi.RootLogger.setLevel(RootLogger.java:65)	at org.apache.log4j.spi.RootLogger.(RootLogger.java:44)	at org.apache.log4j.LogManager.(LogManager.java:78)	at org.apache.log4j.Logger.getLogger(Logger.java:103)	at com.alaxos.blog.database.MySQLBlogConnector.(MySQLBlogConnector.java:43)	at com.alaxos.blog.database.BlogConnectorAdapter.(BlogConnectorAdapter.java:54)	at com.alaxos.blog.tag.SelectBlogDBTagSupport.doStartTag(SelectBlogDBTagSupport.java:52)